Art of vulcanizing rubber



Patented Aug. 2, 1927.

UNITED STATES PATENT oral-e11.

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Ie Drawing,

my invention relates to the art of manufacturmg ,vulcanized rubber compositions and it has particular reference to the employment of a class of chemical com unds that accelerate the process of vulcanization. The object of the invention is to rovide a new class of chemical compounds t at are capable of accelerating the vulcanization reactions and imparting desirable physical in properties to the vulcanlzate. v

A eneric class of, chemical compounds embo ying a thiazole group as a part of their structure is disclosed in the patent to Sebrell and Bedford, No. 1,544,687, July 5, 1925. .These compounds, particularly those having a mercapto group joined to the thiazole ring, at position 2, indicated under approved nomenclature,have been found to be excellent accelerators. A specific compound of this class is 2-mercaptobenzothiazole:

0m 8 \HE 5 The present disclosure to Anamaaamaa a wh a pared flyf Application fled l'ebmry 12,1926. am He. $7,949.

species o'f the substitution or addition prodacts of mercaptothiazoles, and it has articular reference to the halogen derivatives and the salts thereof that have been found to be useful in the manufacture of rubber products. It is deemed unnecessary for a proper understanding of this invention to describe the various methods of forming these compounds, inasmuch as certain methods are known and others are disclosed in the copending application of Sebrell and Top}!- ema, Serial Number 37,861, filed June '7,

fAccelerators that impart desirable uali-V ties to the rubber compositions are p need added may be either aliphatic or cyclic, and

may be aryl radicals having a portion of their structure common to the thiazole ring. An example of the latter group is 2-mer captoben'zothiazole, a species of the class of mercaptoarylthiazoles, which may be united with a halogen atom to form a compound of the class specified herein. g

A compound that may be regarded astyph ical of halogen mercaptobenzothiazoles is 5-chlor-2-mercaptobenzothiazole, represented structurally as:

substances, that follows:

This compound may be prepared from 14- dichlor-nitro-benz'ene, 1-4-dieh1or fl-nitrow benzene is treated with sodium hydI'osulphide and carbon bisulphide in an aqueous solution under ordinary or slightly increased u pressure. The'reactions may be indicated as y .ijnfl QWbenaMhrizola, which maybe, pre- 2-mercaptobenzothiazole is an accelerator having desirable properties. It

may be designated structurally in this manner: V 1

c-sn Time of Tensile Elonga- Accelerator. gg lsg g strengt h tion per bs. gauge. kgs/ cent Hrs. Mina, 2-mercaptobenzothiazole .i--. 40 130 785 5-chlor-2-mercaptcbenzothiazole 40 155 845 5-cb1or6-nitro-Z-mercaptobenzothiazole 1 20 90 860 Zinc salt of 5-cl11or'6-m'tro-2-mercaptobenzothiazole 1 20 105 p 870 The principles of the invention have been disclosed with particular reference to a few specific compounds which fall within the scope thereof, but it is to be understood that these are presented as exemplifying thein vention rather than limiting it. It is in tended, therefore, that only those limitation should be imposed which are required by the scope of the following claims. I

What I claim is:. V V .4 f l. A method of accelerating the vulcanization of caoutchouc that comprises vulcanizing the same in the presence of a halogen.

derivative oi a mercapto-thiazole,

2. A method of acceleratmg the vulcanization of caoutchouc that comprises vulcan-. izing the same in the presence of a halogen derivative of a mercapto-aryl-thiazole.

3. A method of accelerating the vulcanization of caoutchouc that comprises vulcanizing the same in the presence of a chlorine derivative of a mercapto-thiazole.

4. A method of accelerating the vulcanization of caoutchouc that comprises vulcan- I izing the same in the presence of a chlorine derivative of a mercapto-aryl-thiazole.

5. A method of accelerating the vulcanization of caoutchouc that comprises vulcanizing the same in the presence of a chlorine derivative of mercapto-benzo-thiazole.

6. A method of accelerating the vulcanization of caoutchouc that comprises vulcanizing the same in the presence of a chlorine derivative of 2-mercapto-benZo-thiazole.'

7. A method of accelerating the vulcani-- zation of caou'tchouc that comprises vulcanizing the same in the presence of 5-chlor-2- mercapto-benzo-thiazole.

8. The reaction product of caoutchouc vulcanized in the presence of ahalogen derivative of a mercapto-thiazole.

9. The; reaction product of caoutchouc vulcanized in the presence of a halogen derivative of a mercaptoaryl-thiazole 10. The reaction product of caoutchouc vulcanized in'the presence of a chlorine derivative of a mercapto-thiazole. 11. The reaction product of caoutchouc vulcanized in the presence of a chlorine'derivative of a mercapto-aryl-thiazole.

12. The reaction product of caoutchouc vulcanized in the presence of a chlorine derivative of a mercapto benzo-thiazole.

. 13. The reaction product of caoutchouc vulcanized in the resenceof 5-chlor-2-mercapto-benzo-thiazo e.

In witness whereof, I have hereunto signed my name. v

. JAN TEPPEMA. 

